Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/7602#issuecomment-125854520
I think this actually makes it worse, since it is not only accumulating the
result in a `StringBuilder`, but always converting it to a `String` as the
return value from each recursive call. That's not needed, is it? Without that,
I imagine this is a small improvement, but I also do not think this can prevent
an OOM. In its current state I definitely don't see how this fixes the issue.
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